<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>动态运算</title>
</head>
<body>

<form action="/niubi">
    表达式: <input type="text" name="expression"/> <br />
    数据a:<input type="text" name="a"> <br />
    数据b:<input type="text" name="b"> <br />
    数据c:<input type="text" name="c"> <br />
    <button type="submit">提交</button>
</form>



</body>
</html>